UNIX stores all its data in 'files'.
Characters ; - & ` ' " \ / * ? ! | <> () should not be used in the names of 
files . They have a special meanings to the command interpretter or 'shell'.
Character / builds "path names" for files as in /usr/doc/facts.

The simplest way to create a short file is to type 'cat >name-of-file'.
Tapping D while holding down CTRL signals end of input.

Longer files can be made by using 'vi' - see help vi.

To display a short files use 'cat files'
     (other systems use pip list slist copy print output type....)
Use 'ls' to list files in a directory (Others use: dir ld catlist enquire,f)
To copy a file use 'cp from to' ( pip to=from, COPY FROM,TO )
To change a file's name use 'mv oldname newname'
To remove a file use 'rm names' or 'trash names' (others use: kill delete purge)

To remove a file with a nonprinting character try 'rm -i *' or 'rm -i .*'

Danger: cp f1 f2, mv f1 f2, rm f2, and any-command >f2. These all destroy f2.